.main{
    position: relative;
}
.nav{
    text-align: center;
    margin-left: 230px;
}

.nav ul li{
    float: left;
    margin-right: 32px;
}
.nav ul li a{
    display: inline-block;
    color: #727272;
    padding: 20px 0px;
}
.nav ul li a:hover{
    color: red
}
.nav ul li a .hover{
    color: red
}
.banner{
    width: 100%;
    background: url("../images/index_banner.bg.jpg") no-repeat center top;
}
.banner a{
    display: block;
    width: 1200px;
    margin: auto;
}

.m_one{
    margin-top: -50px;
}

/* 产品展览 */
.m_nav{
    padding-left: 50px;
}
.m_nav ul li{
    float: left;
}

.m_nav ul li a{
    display: block;
    width:120px;
    height:30px;
    border: 2px solid red;
    margin: 0px 10px;
    text-align: center;
    line-height: 30px;
    color: red;
}
.m_nav ul li a.hover{
    background: red;
    color: #ffffff;
}

.wenyi{
    display: flex;
    flex-wrap: wrap;
    margin:20px auto;

}
.wenyi img{
    width: 225px;
    height:300px;
    margin:0px 5px;
}
.wenyi dd{
    text-align: center;
}
.wenyi dd span{
    color: red;
}
.wenyi dd del{
    font-size: 12px;
    color: #c0c0c0;
}

.pos_left{
    position: fixed;
    bottom: 20%;
    left: 0;
    display: none;
}

/* 右边黑色栏 */
/* .pos_right{
    height: 545px;

    width: 35px;
    background: black;
    position:fixed;
    right: 0;
} */